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The spectral variation, the correlation of multi-waveband flux and the property of polarization of BL Lac objects give us important information for studying their intrinsic correlation of radiation components. The present paper analyzes the properties of RBLs and XBLs. It is indicated by statistics that the redshift of RBLs are greater than that of XBLs and the black hole mass of RBLs are smaller than that of XBLs. The paper also studies the possible correlations between the redshift and the flux densities for different wavebands in low state, and the possible correlations of flux densities for different wavebands (radio, near-infrared, optical and X-ray) in low state. The results support that the systematic difference between RBLs and XBLs is not caused by the choice effect only.
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Keywords:
- BL Lac objects/
- multi-waveband flux
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